Question
$\frac{3}{5}=\frac{\Box}{20}$

Answer

We have, $\frac{3}{5}=\frac{?}{20}$
$\Rightarrow\frac{3\times4}{5\times4}=\frac{?}{20}$
$\Rightarrow\frac{12}{20}=\frac{?}{20}$ On comparing, we get $?=12$

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